JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Xiujing Huang,Yingbo Chen,Xianshe Feng,Xiaoyu Hu,Yufeng Zhang,Lei Liu
In this study, Ag@ZnO-Oleic acid (OAc)/polyamide (PA) thin film nanocomposite (TFN) membranes were prepared by interfacial polymerization with dispersing hydrophobic Ag@ZnO-OAc core-shell nanoparticles in trimesoyl chloride (TMC) solutions. The Ag@ZnO-OAc nanoparticle structure and interactions between OAc and TMC were confirmed by TEM , XPS and FTIR. Surface morphology , roughness, chemical composition, hydrophilicity and charges of the synthesized membranes were characterized by SEM, FTIR, contact angle and zeta potential analyses. The results showed that incorporating the Ag@ZnO-OAc nanoparticles into the PA layer improved chemical and physical properties of the TFN membranes. Compared with the nanoparticle-free TFC membrane, the Ag@ZnO-OAc/PA TFN membrane showed a considerably higher salt rejection, and a lower flux decline rate when tested with filtration of BSA solution as a model foulant and a higher flux recovery with water flush. In addition, the Ag@ZnO-OAc/PA TFN membrane showed excellent antibacterial performance against E. coli and S. aureus .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 11
·11990-12000
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IF 3.056
Cui Yanping,Thathsarani Nimesha,Peng Liang,Gao Ya,Lei Lidan,Zhou Zhengwei,Liang Lili,Shi Xiaoyan
Innovative paramagnetic one-dimensional (1-D) core-shell Fe-Ag@AgCl visible light-driven photocatalysts are synthesized through a template-assisted electrodeposition method trailed by FeCl 3 in-situ oxidation. The metallic nature of Fe-Ag@AgCl is confirmed through scanning electron microscopy (SEM) and crystal nature through X-ray diffraction (XRD). The controllable diameter of Fe-Ag is obtained through the selection of hollow size of the polycarbonate (PC) template. Electron impedance spectroscopy (EIS) confirms through the introduction of Fe to the Ag core that has prolonged the recombination of electron and hole. Escherichia coli ( E. coli ) are employed as the target bacteria to evaluate the photocatalytic disinfection performances. A total of 1.30 mg of Fe-Ag@AgCl is proved to be able to completely inactivate 10 7 CFU (colony forming units)/mL after 120 min of visible light irradiation. The transition electron microscopy (TEM) confirms the stability of the material after the photo reaction. As Fe-Ag@AgCl possesses magnetic properties, the material is recovered through the application of an external magnetic field. SEM images and results of 3D emission extraction matrix (EEM) depict that the bacteria cell death is caused by membrane permeability changes caused by the reduction of membrane associated proteins.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Bo Hu,Yong Ma,Ning Wang
Drinking water shortage is a worldwide issue, so that the quality control and treatment of industrial sewage is very important. In this present work, Ag doped carbon nanoparticles (Ag-CDs) were prepared by a simple hydrothermal method, which could be used as an antibacterial and simultaneous detection of dichromate (Cr 2 O 7 2− ). The prepared Ag-CDs were characterized through high resolution transmission electron microscopy (HRTEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The characterization results indicated that the diameter of Ag-CDs were distributed in a range of 2.6–6.0 nm (ca. 4.25 nm) with the functional groups such as OH, NH 2 and CONH in the structure. Cr 3+ and Cr 2 O 7 2− could be distinguished under 365 nm UV light or fluorospectrophotometer. The Ag-CDs nanoparticles was also applied to the detection of Cr 2 O 7 2- in real water samples. There exhibits excellent antibacterial performance to both Escherichia coli O157:H7 ( E. coli O157:H7) and Staphylococcus aureus ( S. aureus ) for Ag-CDs nanoparticles. E. coli O157:H7 or S. aureus was deal with 2 μg mL −1 of Ag-CDs nanoparticles under 5 min with a killing rate of 100%, respectively. As a novel dichromate-sensitive antibacterial, the Ag-CDs nanoparticles hold great promise to broaden application in the environment pollution and water purification.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Lianying Lu,Guohong Wang,Ziwei Xiong,Zifei Hu,Yuwei Liao,Juan Wang,Jun Li
A heterojunction of plasmonic Ag particles on Ti 3+ -doped macro-/meso-porous TiO 2 framework consisting of parallel microchannels, denoted as Ag/TiO 2- x , has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO 2- x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO 2- x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO 2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti 3+ -doping at the Ag/TiO 2- x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Huanhuan Li,Xiaoqian Huang,Md. Mehedi Hassan,Min Zuo,Xiangyang Wu,Yiping Chen,Quansheng Chen
Here, we proposed a novel dual-channel biosensor for rapid and sensitive detection of Hg 2+ . Compared with the previous biosensors, the [email protected] /graphene-upconversion ( [email protected] ) was prepared via a facile method and acted as a versatile signal indicator that can simultaneously readout surface-enhanced Raman spectroscopy (SERS) and fluorescence signals for Hg 2+ detection. In this strategy, the core shell magnetite colloid nanocrystal clusters-polymethacrylic acid magnetic beads (MCNCs/PMAA MBs) were synthesized and conjugated with aptamer to specific capture the Hg 2+ . The dual-channel biosensor was thus fabricated by immobilizing the [email protected] onto the surface of MBs through the complementary pairing of aptamer and complementary DNA (cDNA). Upon Hg 2+ incubation, Hg 2+ preferably bound to the MBs-aptamer, resulting in the subsequent release of preloaded [email protected] into supernatants. Under magnetic attraction, the MBs-aptamer was accumulated immediately, resulting in the concentration of Hg 2+ become homodromous proportional to the dual channel intensity of the supernatants. Under the optimized conditions, the dual channel biosensor achieved excellent performances for Hg 2+ with limits of detection (LOD) of 0.33 and 1 ppb, respectively. Furthermore, the feasibility of the biosensor to qualify Hg 2+ was also established in spiked tap water and milk samples. This strategy may provide a bridge between a highly sensitive fluorescence assay and a rapid SERS assay, it can broaden the applicability of Hg 2+ detection, which can be easy to detect Hg 2+ in real samples by coupling with SERS or fluorescence assay.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yifei Zhan,Jianwu Lan,Jiaojiao Shang,Lin Yang,Xinmei Guan,Wenxu Li,Siqi Chen,Ying Qi,Shaojian Lin
A ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat was successfully fabricated via stepwise in-situ growth method. The morphology and composition of the resultant ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat were confirmed by emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS), respectively. Next, methylene blue (MB) was employed as a contaminant to evaluate photocatalytic activity of prepared composite photocatalysts under visible light and natural sunlight irradiation. As expected, the ZIF-8/Ag/AgCl/TiO 2 decorated PAN nanofibrous mat exhibited high photocatalytic activity under both light sources, owing to the synergistic effect among ZIF-8, Ag/AgCl and TiO 2 . The degradation efficiency of the targeted PAN nanofibrous mat under visible light could reach to 98.02% within 120 min towards 20 mL of 50 mg/L MB aqueous solution. Most importantly, the fabricated ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat exhibited outstanding recyclability, the corresponding degradation efficiencies were up to 90.16% after five cycles and approximately 80% after ten cycles, respectively. Additionally, the resultant nanofibrous mat showed a long-term stability against acid and alkaline, and excellent antimicrobial performance against S. aureus and E. coli .
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Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 5
·813-823
·
IF 3.552
Wang Mengyun,Zhang Shengbo,Li Mei,Han Aiguo,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
Novel, hierarchical, flower-like Ag/Cu 2 O and Au/Cu 2 O nanostructures were successfully fabricated and applied as efficient electrocatalysts for the electrochemical reduction of CO 2 . Cu 2 O nanospheres with a uniform size of ∼180 nm were initially synthesized. Thereafter, Cu 2 O was used as a sacrificial template to prepare a series of Ag/Cu2O composites through galvanic replacement. By varying the Ag/Cu atomic ratio, Ag 0.125 /Cu 2 O, having a hierarchical, flower-like nanostructure with intersecting Ag nanoflakes encompassing an inner Cu 2 O sphere, was prepared. The as-prepared Ag x /Cu 2 O samples presented higher Faradaic efficiencies (FE) for CO and relatively suppressed H 2 evolution than the parent Cu 2 O nanospheres due to the combination of Ag with Cu 2 O in the former. Notably, the highest CO evolution rate was achieved with Ag 0.125 /Cu 2 O due to the larger electroactive surface area furnished by the hierarchical structure. The same hierarchical flower-like structure was also obtained for the Au 0.6 /Cu 2 O composite, where the FE CO (10%) was even higher than that of Ag 0.125 /Cu 2 O. Importantly, the results reveal that Ag 0.125 /Cu 2 O and Au 0.6 /Cu 2 O both exhibit remarkably improved stability relative to Cu 2 O. This study presents a facile method of developing hierarchical metal-oxide composites as efficient and stable electrocatalysts for the electrochemical reduction of CO 2 .
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FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 9
·1803-1811
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IF 1.439
Duan Panpan,Xu Qingbo,Shen Shuyang,Zhang Yanyan,Zhang Lei,Fu Feiya,Liu Xiangdong
We presented a one-pot approach for fabrication of antibacterial cotton fabric using an emulsion of silver nanoparticles (Ag NPs) protected by mercaptosuccinic acid (MSA). The emulsion was used to finish cotton fabrics via a pad-dry-cure process, making the MSA molecules covalently linked to the cotton fibers by ester linkages with the hydroxyl groups of cellulose. The coordination bonds between the MSA molecules and the Ag NPs provide stable and durable effect on the immobilization of the Ag NPs on the cotton fabric, endowing its antibacterial function with an outstanding laundering durability. Even experienced 50 consecutive laundering tests, the modified cotton fabric exhibits satisfactory bacterial reduction rates against both Staphylococcus aureus and Escherichia coli. This paper provides a simple fabrication methodology to mitigate the safely risk and environmental impact that are typically found in the antimicrobial cotton textiles based on Ag NPs.
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Wenxia Wang,Zhen Li,Kailin Wu,Guodong Dai,Qingping Chen,Lihua Zhou,Junxia Zheng,Liang Ma,Guiying Li,Wanjun Wang,Taicheng An
Rational design and synthesis of highly efficient and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental applications is critical. Herein, aiming at overcoming the common shortcomings of traditional photocatalysts such as weak photoresponsivity, rapid combination of photo-generated carriers and unstable structure, a novel Ag-bridged dual Z-scheme g-C 3 N 4 /BiOI/AgI plasmonic heterojunction was successfully synthesized using a facile method. Results showed that Ag-AgI nanoparticles and three-dimensional (3D) BiOI microspheres were decorated highly uniformly on the 3D porous g-C 3 N 4 nanosheet, resulting in a higher specific surface area and abundant active sites. The optimized 3D porous dual Z-scheme g-C 3 N 4 /BiOI/Ag-AgI manifested exceptional photocatalytic degradation efficiency of tetracycline (TC) in water with approximately 91.8% degradation efficiency within 165 min, outperforming majority of the reported g-C 3 N 4 -based photocatalysts. Moreover, g-C 3 N 4 /BiOI/Ag-AgI exhibited good stability in terms of activity and structure. In-depth radical scavenging and electron paramagnetic resonance (EPR) analyses confirmed the relative contributions of various scavengers. Mechanism analysis indicated that the improved photocatalytic performance and stability were ascribed to the highly ordered 3D porous framework, fast electron transfer of dual Z-scheme heterojunction, desirable photocatalytic performance of BiOI/AgI and synergistic effect of Ag plasmas. Therefore, the 3D porous Z-scheme g-C 3 N 4 /BiOI/Ag-AgI heterojunction had a good prospect for applications in water remediation. The current work provides new insight and useful guidance for designing novel structural photocatalysts for environment-related applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Tingting Han,Chunyue Xia,Yang Huang,Chong Sun,Dengyong Liu,Weimin Xu,Daoying Wang
In this study, an intelligent sensing label was developed with poly (vinyl alcohol)-Ag (PVA-Ag) nano-colloids as the carrier polymers and grape seed anthocyanidin (GSA) as indicators for the assessment of meat freshness. The colorimetric response, morphology and stability of PVA-Ag-GSA sensing label were investigated by UV- vis spectra, scanning electron microscope (SEM), thermal properties, mechanical property and hydrophilicity studies, etc. Moreover, the sensing label showed visible changes from red to yellow when employed to monitor the freshness of pork. Concerning the difficulty in distinguishing the approximate colors obtained from the sensing label, quantitative evaluation was implemented by Red-Green-Blue (RGB) and Hue Saturation Value (HSV) model. Hue (H) values showed a linear response to the total volatile basic nitrogen (TVB-N) concentration in the range of 13.1–31.1 mg/100 g during storage of 4 °C, and in the range of 12.1–30.6 mg/100 g at 10 °C. On this basis, the values calculated from the linear regression equation were in good agreement with those obtained from the contents of TVB-N measured by acid-base titration, confirming applicability of the sensing label. These results showed that the prepared sensing label could be applied in real-time freshness monitoring with satisfaction and efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yanling Jin,Wenwen Tang,Jiayi Wang,Zhengyan Chen,Fang Ren,Zhenfeng Sun,Fangfang Wang,PengGang Ren
Titanium dioxide (TiO 2 ) has been considered as a promising photocatalyst for degrading organic pollutants due to its stability, low energy consumption and non-toxicity. Nevertheless, the aggregation tendency, relatively wide band gap and easy recombination of electron-hole pairs confine the photocatalytic activity and practical applications of TiO 2 nanoparticles . Herein, a novel Ag/TiO 2 /carbon skeleton derived from spent coffee grounds (CSCG) ternary photocatalyst was developed by in-situ growth of TiO 2 and Ag nanoparticles onto 3D activated CSCG via a hydrothermal process and subsequent photodeposition method. The utilization of excellent conductive CSCG as catalytic carrier can not only alleviate the aggregation of TiO 2 nanoparticles, but also suppress the recombination of photogenerated electron hole pairs . Besides, the surface plasmon resonance (SPR) effect of Ag reduces the band gap of the material and widens light-responsive region, thereby endowing Ag/TiO 2 /CSCG photocatalyst with enhanced photocatalytic degradability for organic pollutants. The as-prepared photocatalyst exhibits high degradation effects on dyes and antibiotics, such as degradation rate of 96.2% for methylene blue (MB), methyl orange (MO: 94%), tetracycline (TC: 99%), and norfloxacin (NOF: 96%). In addition, the hybrid photocatalyst displays up to 91% degradation efficiency of MB after four cycles. This work presents an innovative perspective to construct TiO 2 -based hybrid photocatalyst for boosting photocatalytic performance of wastewater treatment and environmental remediation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Huan Cheng,Kuang Luo,Xiaojun Wen,Jie Yang,Jumei Li
The development of sensitive, reliable, and robust substrates for surface-enhanced Raman spectroscopy (SERS) heavily relies on the creation of numerous hot spots. In this study, we propose a simple approach to fabricate core-satellite composites composed of AgTNP@TiO 2 @Ag, where Ag triangular nanoplates (AgTNPs) act as the cores, TiO 2 serves as the interlayer, and Ag nanoparticles are deposited around them to form Ag satellites. By adjusting the amount of AgNO 3 , we precisely control the coverage of Ag nanoparticles on AgTNP@TiO 2 @Ag, thus fine-tuning their SERS sensitivity. Various characterization techniques were employed to examine their composition, morphology, and crystal structure. Thanks to the abundant hot spots created by the Ag satellites, these composites exhibit significantly enhanced SERS sensitivity and they demonstrate the capability to detect methylene blue (MB) at a concentration of 10 −10 M by portable Raman spectrometer. Moreover, the AgTNP@TiO 2 @Ag composites effectively enable in situ SERS monitoring of the photodegradation reaction of MB. Overall, the novel AgTNP@TiO 2 @Ag composites prepared in this study exhibit high SERS sensitivity and excellent photocatalytic performance, making them highly valuable for environmental detection and ecological restoration purposes.
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